Sep 12 – 17, 2010
CERN
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7Li quadrupole-perturbed NMR observation of biased Li-ion ordering in the paraelectric phase of weakly substitutionally disordered K1-xLixTaO3

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

CH - 1211 Geneva 23 Switzerland
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POSTER Resonance Methods

Speaker

Prof. Boštjan Zalar (J. Stefan Institute)

Description

Substitution of K ions with Li ions in the KTaO3 lattice is a textbook example of how to induce structural disorder, leading to a glass-like behavior [1]. Li impurities act like randomly interacting electric dipoles, with six discrete instantaneous orientations pointing along the cubic axes. For low Li concentrations x, dipolar glass state is established at low temperatures. At high temperatures, no behavior reminiscent of Li-Li pair interplay has been observed, apart from a two-timescale Li dynamics [2,3]. The absence of satellite transition features in the quadrupole-perturbed 7Li (I = 3/2) NMR spectra [2, 3] is somewhat surprising, since the statistical probability of Li-Li pairs is far from being negligible for Li-concentrations at which dipolar state is formed at low temperatures (x ≤ 0.04).
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Primary author

Prof. Boštjan Zalar (J. Stefan Institute)

Co-authors

Dr Andrija Lebar (J. Stefan Institute, Ljubljana, Slovenia) Prof. David C. Ailion (Department of Physics, University of Utah, Salt Lake City, USA) Dr I. V. Kondakova (Institute for Problems of Materials Sciences, Kiev, Ukraine) Dr R. O. Kuzian (Institute for Problems of Materials Sciences, Kiev, Ukraine) Prof. Valentin V. Laguta (Institute of Physics, AS CR, Prague, Czech Republic)

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